Metal roofing panel length estimator

Metal Roof Length Calculator

Convert roof run, pitch, and overhang into sloped metal panel length, then estimate panel rows, total panels, waste, and rough panel cost. Use it when GSC-style roof length searches need a panel-length answer before ordering.

Units

Horizontal roof run (ft)Roof pitch rise per 12 Eave overhang (ft)Roof width along eave (ft)Panel coverage width (ft)Roof planes Waste / extra panels (%)Cost per panel ($)

Cut panel length

Panels to buy

Rows per plane

Rough cost

Metal roof panels need product checks

Panel length limits, end laps, ridge/trim details, minimum slope, fastening pattern, expansion, delivery limits, roof penetrations, and manufacturer instructions can change the final order. This is a field estimate, not a stamped roof design.

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Metal Roofing Calculator

Estimate full metal roof panel counts and slope roof area.

Roof Pitch Calculator

Convert rise/run into pitch, angle, and multiplier.

Rafter Length Calculator

Compare roof run and pitch against framing length.

View all

Metal roof length formula

Slope panel length = √((run + overhang)² + rise²)

Rise = (run + overhang) × pitch ÷ 12

Rows per plane = roof width ÷ panel coverage

Panels to buy = rows × roof planes × (1 + waste %)

Sample takeoff

A 12 ft run at 6/12 pitch with 1 ft overhang needs about 14.5 ft panels. A 40 ft roof width with 3 ft panel coverage on two planes needs about 31 panels with 10% waste.A 3.6 m run at 6/12 pitch with 0.3 m overhang needs about 4.4 m panels. A 12 m roof width with 0.9 m coverage on two planes needs about 31 panels with 10% waste.

Metal Roof Length Calculator FAQ

How do I calculate metal roof panel length?+

Add the planned overhang to the horizontal run, multiply by pitch over 12 to get rise, then use the right-triangle length: √(run² + rise²).Add the planned overhang to the horizontal run, multiply by pitch over 12 to get rise, then use the right-triangle length: √(run² + rise²).

Is this the same as a full metal roofing takeoff?+

No. This page focuses on panel length and rows. Use the metal roofing calculator for broader area and cost planning, then verify trim, ridge, rake, valley, and fastener details.No. This page focuses on panel length and rows. Use the metal roofing calculator for broader area and cost planning, then verify trim, ridge, rake, valley, and fastener details.

Should panels be ordered in one piece?+

Only if the manufacturer, handling, delivery, and roof geometry support it. Long panels may need end laps or special delivery, so confirm product limits before ordering.Only if the manufacturer, handling, delivery, and roof geometry support it. Long panels may need end laps or special delivery, so confirm product limits before ordering.